IDENTIFICATION OF QTL CONFERRING ADULT PLANT RESISTANCE TO WHEAT STRIPE RUST IN BREAD WHEAT LANDRACE BWLR-2347

Abstract

Stripe rust is among the most destructive foliar diseases affecting wheat globally. The identification of novel adult plant resistance loci represents a critical strategy for mitigating the substantial yield losses attributed to stripe rust across diverse regions worldwide. Wheat landraces possess untapped genetic resources for abiotic and biotic stresses including diseases like stripe rust. This study was conducted to identify the genetic basis of adult plant resistance response in bread wheat landrace BWLR-2347 conserved at ICARDA gene bank. The mapping population of 178 F2 individuals was genotyped with high quality genotype-by-sequencing derived SNPs. The phenotypic disease assessment was carried out in F2:3 families derived from the cross between resistant bread wheat landrace BWLR-2347 and susceptible Avocet “S” in the field under artificial inoculation with a mixture of stripe rust races. Seven QTLs were identified for resistance to YR at the adult plant growth stage and mapped on five chromosomes. The QTLs were detected on the 1B, 2A, 2B, 2D, and 5A regions. The phenotypic variance explained by an individual QTL ranged from 2.01% to 5.59%. The study validated the six previously identified QTL and reported a novel QTL at chromosome 5A. The information obtained from the study will be helpful in wheat breeding programs towards the development of stripe rust resistant cultivars.

Keywords

• DArt
• QTL mapping
• Stripe rust
• Türkiye
• Wheat

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